Which of the Following Statements About Price Discrimination Is True

Which of the following statements about price discrimination is true?

A) It exists whenever consumers in a country are charged different prices for the same product.
B) A necessary condition for profitable price discrimination is different price elasticities of demand in different countries.
C) It is the use of price as a competitive weapon to drive weaker competitors out of a national market.
D) It makes economic sense to charge the same prices across countries.